@Insert("<script>" +
        "INSERT INTO user(username, password, email, create_time) VALUES " +
        "<foreach collection='list' item='item' separator=','>" +
        "(#{item.username}, #{item.password}, #{item.email}, #{item.createTime})" +
        "</foreach>" +
        "</script>")
@Options(useGeneratedKeys = true, keyProperty = "id")
int batchInsert(List<User> users);